CN101772179A - Method and system for transmitting system information in carrier aggregation scene - Google Patents
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Abstract
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a system for transmitting system information under a carrier aggregation scene under a large bandwidth.
Background
In order to meet the requirements of the International telecommunications union-Advanced (ITU-Advanced for short), a Long Term evolution-Advanced (LTE-a) system, which is an evolution standard of LTE (Long Term evolution, LTE for short), needs to support a larger system bandwidth (up to 100MHz) and needs to be backward compatible with the existing standard of LTE. On the basis of the existing LTE system, the bandwidth configuration of the LTE system can be combined to obtain a larger bandwidth, which is called Carrier Aggregation (CA) technology, and the Carrier Aggregation technology can improve the spectrum utilization rate of the IMT-Advance system, alleviate the shortage of spectrum resources, and further optimize the utilization of spectrum resources.
In the LTE system, a Physical downlink control channel (PDCCH for short): the method is used for bearing uplink and downlink scheduling information and uplink power control information.
In the LTE system, a Physical Downlink Shared Channel (PDSCH) is used to transmit user data.
The formats of Downlink Control Information (DCI) are classified into the following: DCI format 0, 1A, 1B, 1C, 1D, 2A, 3A, etc. Wherein,
● DCI format 0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH);
● DCI format 1, 1A, 1B, 1C, 1D is used for different transmission modes of Physical Downlink Shared Channel (PDSCH for short) of single transmission block;
● DCI format 2, 2A is used for different transmission modes of downlink PDSCH space division multiplexing;
● DCI format 3, 3A is used for transmission of a Physical Uplink Control Channel (PUCCH) and a power control command of a PUSCH.
The transport block sizes of the DCI formats 0, 1A, 3, and 3A are the same, where 1 bit is used for format differentiation in the DCI formats 0 and 1A.
The information transmitted by the DCI Format 1A is as follows:
a process of blind detection of a physical downlink Control channel PDCCH in LTE is briefly described as follows, where a Control Channel Element (CCE) is a minimum element for carrying PDCCH resources, and a Control region is composed of a series of CCEs.
The PDCCH blind detection range is defined by a search space, and the search space is divided into a public search space and a UE special search space. Search space Sk(L)Is defined as:
the CCE aggregation level L ∈ {1, 2, 4, 8}, YkFor a common search space YkAnd (5) searching for CCE (0-15). Search space Y dedicated to UEk＝(A·Yk-1)modD，Y-1＝nRNTI≠0，A＝39827，D＝65537，
nsThe time slot numbers 0 to 19. i-0, …, L-1, M-0, …, M(L)-1.M(L)Is the number of given PDCCH candidate sets (candidates) in the search space L.
Wherein n isRNTIAnd represents a Radio Network Temporary Identifier (RNTI). N isRNTICorresponding to one value among the following radio network temporary identities:
system information-RNTI (System information-RNTI, abbreviated as SI-RNTI),
random access-RNTI (RA-RNTI),
calling RNTI (Paging-RNTI, abbreviated as P-RNTI),
Cell-RNTI (Cell-RNTI, simply referred to as C-RNTI),
semi-persistent scheduling RNTI (Semi-persistent scheduling RNTI, abbreviated as SPS-RNTI),
temporary cell RNTI (Temporary C-RNTI).
N isRNTISpecifically, which type of RNTI is configured by a high-level signaling is selected, and a specific value is also specified by corresponding signaling and data. Values of RNTI are shown in table 1 below. Referring to table 2 below, the search space defined according to the aggregation level is detected according to DCI format corresponding to the downlink transmission mode when the UE performs blind detection. A 16-bit Cyclic Redundancy Check (CRC) of each downlink control information DCI is scrambled with the RNTI described above. Different UEs may configure different RNTIs to scramble the CRC, so that DCI of different UEs may be distinguished.
Table 1: RNTI value
Table 2: PDCCH candidates monitored by UE
In the LTE System, System Information (SI) is allocated to resources through DCIformat 1A/1C. The blind detection of SI is only done in the common search space and the CRC of the DCI of SI is scrambled with a unique SI-RNTI.
In the LTE-a carrier aggregation scenario, multiple carrier types are introduced. LTE-a carrier types can be divided into: a backward compatible carrier (backward compatible carrier), a Non-backward compatible carrier (Non-backward compatible carrier), and an Extension carrier (Extension carrier).
The extension carrier has two meanings: 1) as part of a Component Carrier (CC); 2) as an independent component carrier. The extension carrier cannot work independently, and must belong to a part of a set of component carriers, and at least one of the component carriers in the set can work independently. The extension carrier is not visible to LTE UEs.
For simplicity of design and to allow for a variety of possible application scenarios, the extension carrier is most likely configured without PDCCH. DCI corresponding to the system information of the extension carrier needs to be transmitted on other component carriers. In addition, LTE-a also introduces the concept of a camping carrier, i.e. after the carrier initially accessed by the UE is successfully accessed, the camping carrier can be reconfigured to the UE through a high-level signaling, so as to ensure load balancing.
Under an LTE-A carrier aggregation scene, a PDCCH component carrier set (PDCCH CCset) is defined, and UE needs to perform blind detection in the PDCCH CCset; a Downlink component carrier set (DL CC set) is also defined, and a PDSCH of a UE may be transmitted on any CC in the DL CC set. In the LTE-a carrier aggregation scenario, cross-carrier scheduling is allowed, i.e., a PDCCH on a certain component carrier can schedule a PDSCH or a PUSCH on multiple component carriers. In cross-carrier scheduling, when a PDSCH of a carrier other than the carrier where the PDCCH is located is solved, system information of the carrier where the PDSCH is located needs to be known.
Therefore, in the LTE-a system, how to acquire system information of a component carrier B (a ≠ B) on a component carrier a by a user equipment UE becomes a technical problem to be solved in a scenario of configuring an extension carrier or cross-carrier scheduling.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method and a system for transmitting system information in a carrier aggregation scenario, so as to achieve how to acquire system information of an extension carrier or a cross-carrier, and achieve correct acquisition of system information in the carrier aggregation scenario.
In order to solve the above problem, the present invention provides a method for transmitting system information in a carrier aggregation scenario, including:
selecting a component carrier for system information to be sent, and sending the system information to be sent to User Equipment (UE) on the selected component carrier by a base station;
and indicating the component carrier corresponding to the system information to be sent on the selected component carrier by using a wireless network temporary mark with carrier indication characteristics or a downlink control information format carrying carrier indication information.
The transmission method further comprises the following steps:
and the User Equipment (UE) receives the system information on the selected component carrier, and distinguishes the component carrier corresponding to the system information by utilizing the wireless network temporary mark with carrier indication characteristics or the carrier indication information in the downlink control information format.
The step of selecting component carriers for system information to be transmitted may be implemented in one of the following manners or a combination thereof:
the high layer signaling indicates the selected component carrier; automatically defaulting a unique carrier or a unique associated carrier; randomly selecting component carriers from a Physical Downlink Control Channel (PDCCH) component carrier set; the anchor carrier is employed as the selected component carrier.
The step of indicating the component carrier corresponding to the system information to be sent on the selected component carrier by using the radio network temporary mark with the carrier indication characteristic or the downlink control information format carrying the carrier indication information is realized by defining a carrier indication radio network temporary identifier (CI-RNTI) or defining a downlink control information format (DCI format X).
The carrier indication radio network temporary identifier value CI-RNTI is configured for each component carrier scheduled by the cross-carrier by a base station through high-level signaling, and the CI-RNTI values allocated to different component carriers are different;
and scrambling the Cyclic Redundancy Check (CRC) of the downlink control information format DCI format 1A/1C which is sent on the selected component carrier and carries the corresponding system information by using the CI-RNTI of the selected component carrier.
The downlink control information format DCI format X at least comprises Carrier Indication (CI) information; adopting a centralized virtual resource block or a distributed virtual resource block resource allocation mode to indicate bits; resource block allocation bits, modulation coding mode indication bits and redundancy version indication bits.
And scrambling downlink control information format DCI format X carrying the system information to be sent by adopting X-RNTI.
The DCI format X carrying the other carriers SI may be defined to be located in a common search space or a UE-specific search space, or may be defined to be located only in a common search space.
The DCI format X is a downlink control information format combined in the DCI format 1A, and when CRC of DCI of high-level signaling configuration system information is scrambled by X-RNTI, downlink control information solved by User Equipment (UE) corresponds to information carried by the DCI format X.
The DCI format X is an independent downlink control information format, and at this time, the DCI format X also carries bit information distinguished from the DCI format 0/1a format.
The invention also provides a transmission system of system information under the carrier aggregation scene, which comprises: base station and user equipment UE, wherein:
the base station is used for selecting a component carrier for the system information to be sent and sending the system information to be sent to User Equipment (UE) on the selected carrier, wherein the component carrier corresponding to the system information to be sent is determined on the selected component carrier by utilizing a wireless network temporary mark with carrier indication characteristics or a downlink control information format carrying the carrier indication information;
and the user equipment UE is used for receiving the system information sent from the base station on the selected component carrier, and distinguishing the component carrier corresponding to the system information by utilizing the wireless network temporary mark with the carrier indication characteristic or the carrier indication information in the downlink control information format.
The base station selects component carriers for system information to be sent through one or the combination of the following modes:
the high layer signaling indicates the selected component carrier; automatically defaulting a unique carrier or a unique associated carrier; randomly selecting a component carrier from the PDCCH component carrier set, and employing the camping carrier as the selected component carrier.
When the base station determines the component carrier corresponding to the system information to be sent on the selected component carrier by using the radio network temporary mark with the carrier indication characteristic or the downlink control information format carrying the carrier indication information, the base station is realized by defining a carrier indication radio network temporary identifier (CI-RNTI) or defining a new downlink control information format (DCI format X).
The transmission method and the system of the system information under the carrier aggregation scene can realize the transmission of the system information of the cross carrier, and utilize high-level signaling to indicate the selected component carrier by solving the problems of which component carrier or component carriers are adopted to send the system information, how to indicate the sent system information on the selected carrier as the system information of which component carrier, and the like; automatically defaulting a unique carrier or a unique associated carrier; randomly selecting component carriers from a Physical Downlink Control Channel (PDCCH) component carrier set; and selecting the carrier wave by adopting a resident carrier wave as a selected component carrier wave and the like, and indicating the carrier wave corresponding to the carried system information by utilizing the CI-RNTI and the new DCI format so that the terminal can correctly receive the carrier wave. Therefore, the downlink control information of the system information of other carriers can be sent on one carrier, and the problem of obtaining the system information in a carrier aggregation scene is solved.
Drawings
Fig. 1 is a schematic diagram of cross-carrier transmission of system information in a carrier aggregation scenario;
fig. 2 is a schematic diagram of a transmission system for transmitting system information across carriers in a carrier aggregation scenario.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
In an LTE-A system, when system information of a component carrier A is transmitted on the component carrier A, the transmission method is consistent with that in the LTE system; but how the system information of the component carrier a should be processed when the system information of the component carrier a is not transmitted on the component carrier a, the technical solution of the present invention will be explained.
The invention provides a transmission method and a transmission system of system information under a carrier aggregation scene, aiming at the problem of how to send and receive and process the system information of a component carrier on a non-local component carrier when an extension carrier or cross-carrier scheduling is configured in an LTE-A system. The invention decomposes the technical problem into: and selecting which component carrier or component carriers are adopted to transmit the system information, and how to indicate the transmitted system information on the selected carrier as the system information of which component carrier, so that the User Equipment (UE) can identify and accurately acquire the system information of each component carrier. By selecting the sent component carrier and accurately indicating which component carrier the system information corresponds to, the downlink control information of the system information of other carriers can be sent on one carrier, so that the problem of obtaining the system information in a carrier aggregation scene is solved.
Based on the above thought, the method for transmitting system information in a carrier aggregation scenario of the present invention includes:
selecting a component carrier for system information to be sent, and sending the system information to be sent to User equipment (User equipment, simply referred to as UE) on the selected carrier by a base station, wherein the component carrier corresponding to the system information to be sent is determined on the selected component carrier by using a newly defined RNTI or DCI containing carrier indication information.
In the above method, the step of selecting component carriers for system information to be transmitted may be implemented in one or a combination of the following manners:
a high layer signaling indication; automatically defaulting; randomly selecting; and transmitting on the camping carrier. Wherein:
● manner of high layer signaling indication
A base station selects a component carrier for sending system information, the base station sends the indication information of the selected component carrier to one or more UE (user equipment) through a third Radio Resource Control (RRC) layer by using a high-level signaling, and the UE analyzes the high-level signaling to obtain the indication information of the selected component carrier; and the base station sends the DCI of the system information on the selected component carrier, and the UE detects the DCI of the system information on the selected carrier.
● automatic default mode
When the PDCCH component carrier set is only one for the UE, or when the extension carrier B is only associated with one component carrier a, the DCI of the system information that the former UE needs to blindly detect is on the unique component carrier a, and the DCI of the system information that the latter UE needs to blindly detect is on the unique component carrier a, then no high layer signaling indication is needed.
● random selection mode
Any one component carrier may be selected from the component carrier set of the PDCCH to transmit DCI of SI of an extension carrier or DCI of SI of a component carrier scheduled by cross-carrier. For example, one component carrier a may be selected from the component carrier set optionally for transmitting DCI extending the system information of the carrier B.
● manner of transmitting on the localized carrier
When the UE needs to acquire the system information of other component carriers except the component carrier set of the PDCCH, the DCI of the system information is transmitted on the downlink camping carrier of the UE.
In the method, the step of determining the component carrier corresponding to the DCI of the system information to be transmitted on the selected component carrier by using the newly defined RNTI or the DCI containing the carrier indication information can be implemented by defining a radio network temporary identifier CI-RNTI with a carrier indication feature or defining a new downlink control information format DCI format. Wherein:
● Using CI-RNTI indications
When component carriers scheduled by cross-carrier exist in a cell, different CI-RNTIs are configured for each component carrier scheduled by cross-carrier through high-level signaling, the value of the CI-RNTI can be selected from RNTI values reserved in an LTE system, namely the value of the CI-RNTI values comprises reserved values FFF 3-FFFC, and different component carriers have different CI-RNTI values and do not conflict with RNTIs of other types.
When the SI of the component carrier B is transmitted on the carrier B, the CRC of the DCI format 1A/1C carrying the SI is scrambled by the SI-RNTI directly, and when the DCI of the SI of the component carrier B is not transmitted on the carrier B, for example, when the DCI is transmitted on the component carrier A selected by the above four modes, the CRC of the DCI format 1A/1C carrying the SI is scrambled by the CI-RNTI of the component carrier B. The UE achieves the purpose of distinguishing the system information of different component carriers through descrambling and checking the DCI.
The DCI format 1A scrambled with the CI-RNTI may be defined to be located only in a common search space, or may be located in a common search space or a UE-specific search space.
The DCI format 1C scrambled with the CI-RNTI is located only in the common search space.
● with DCI format X indication dedicated to indicating other carriers SI
Defining a downlink control information format DCI format X specially used for indicating system information of other carriers, wherein the overhead of the DCI format X is consistent with that of the DCI format 1A;
the DCI format X at least comprises:
carrier Indicator (CI) information;
the centralized virtual resource block or the distributed virtual resource block resource represents an indication bit;
allocating bits to the resource blocks;
modulation coding mode indication bits;
a redundancy version indication bit.
Further, the PDCCH carrying the DCI format X scrambles the CRC using a proprietary X-RNTI. Further, the DCI format 1A/X carrying other carriers SI may be located in a common search space or a UE-specific search space. It should be noted that the DCI format X may be incorporated in the DCI format 1A, and when the higher layer signaling configuration system information is scrambled by the X-RNTI, the DCI information resolved by the UE corresponds to the information carried by the DCI format X. The X-RNTI can be selected from RNTIs reserved in an LTE system, namely FFF3 to FFFC.
The DCI format X may also be an independent DCI format, and in this case, the DCI format X also carries bit information distinguished from the DCI format 0/1a format.
The PDSCH of the system information may be defined to be transmitted on the own carrier, i.e., the PDSCH of the system information of the component carrier a is transmitted on the component carrier a. It may also be defined that the PDSCH of the system information is transmitted on the same carrier as the DCI.
As shown in fig. 2, a transmission system of system information in a carrier aggregation scenario is shown, where the transmission system includes: base station and user equipment UE, wherein:
the base station is used for selecting a component carrier for the system information to be sent and sending the system information to be sent to the user equipment UE on the selected carrier, wherein the component carrier corresponding to the system information to be sent is determined on the selected component carrier by utilizing a wireless network temporary mark with carrier indication characteristics or a downlink control information format carrying the carrier indication information.
And the user equipment UE is used for receiving the system information sent from the base station on the selected component carrier, and distinguishing the component carrier corresponding to the system information by utilizing the wireless network temporary mark with the carrier indication characteristic or the carrier indication information in the downlink control information format.
And the UE further resolves the physical downlink shared channel of the corresponding component carrier according to the downlink control information DCI of the received system information.
The system information in LTE-A can be subjected to cross-carrier scheduling; that is, Downlink Control Information (DCI) related to System Information (System Information) of carrier B may be sent by the base station to the UE on other carrier a (B is not equal to a), and the UE may detect Downlink Control Information (DCI) related to System Information of carrier B on carrier a;
the carrier wave for sending the downlink control information related to the system information of the carrier wave B can be configured through a high-level signaling; or any carrier in the PDCCH component carrier set; or a camping carrier; or only one component carrier a in the PDCCH component carrier set of the UE or only one component carrier a associated with the extension carrier B, where the system information that the UE needs to detect is on the only component carrier a.
In the transmission system, the DCIs with different carrier system information sent on the same carrier are scrambled by scrambling different scrambling codes for the PDCCHs carrying the corresponding DCIs, so that the DCIs with different carrier system information are distinguished. Allocating a Carrier indication wireless network temporary Identifier (CI-RNTI) to each component Carrier needing cross-Carrier scheduling in a cell, and scrambling CRC by using a scrambling code corresponding to each Carrier in a PDCCH (physical downlink control channel) of DCI (downlink control information) carrying corresponding system information of each Carrier;
the CRC of DCI format 1A/1C of system information of each carrier is scrambled with a given CI-RNTI. In detecting DCI, the UE may distinguish system information of each carrier by the CI-RNTI.
In the transmission system, a DCI format X dedicated to indicate other carriers SI may be further defined, where the overhead of the DCI format X is consistent with the DCI format 1A of the component carrier where the DCI format X is located; the consistency refers to that original information before encoding is consistent, that is, the information domain and the domain size are consistent.
The DCI format X comprises:
carrier Indicator (CI) information,
the localized virtual resource blocks or distributed virtual resource block resources represent indication bits,
the resource block is allocated with bits that,
a modulation and coding scheme indication bit is modulated,
a redundancy version indication bit.
DCI format X scrambles CRC using a proprietary X-RNTI. The DCIformat 1A/X carrying the other carriers SI may be located in a common search space or a UE-specific search space.
The DCI format X may be merged in the DCI format 1A, and when the higher layer signaling configuration SI is scrambled by the X-RNTI, the DCI information resolved by the UE corresponds to information carried by the DCI format X. The X-RNTI can be selected from RNTIs reserved in an LTE system, namely FFF3 to FFFC.
The DCI format X may also be an independent DCI format, and in this case, the DCI format X also carries bit information distinguished from the DCI format 0/1a format.
Example 1
In this embodiment, a high-level signaling configuration mode is adopted to select a component carrier for sending system information, and CI-RNTI is adopted to perform scrambling indication. Referring to fig. 1, it is assumed that there are three carriers CC1, CC2, CC 3. CC3 is an extension carrier, and PDCCH CC set (component carrier set) of UE has 2 component carriers, denoted as CC1 and CC 2.
Since the extension carrier CC3 has no PDCCH, the system information of the extension carrier may be sent on other component carriers as indicated by higher layer signaling.
The CI-RNTI allocated to the CC3 by the higher layer signaling is FFFC (16 system).
If the system information of the extension carrier CC3 is indicated by the higher layer signaling to be transmitted on the component carrier CC2, the CRC of the corresponding DCI is scrambled with CI-RNTI (16 ary) of the extension carrier CC3, the UE blindly detects the system information SI of the extension carrier CC3 on the CC2 according to the higher layer signaling indication, detects DCI formats 1C and 1A in the common search space, detects DCI format 1A in the UE-specific search space, and decodes the CRC and DCI check information with CI-RNTI (FFFC) of the extension carrier CC 3.
Through the above steps, the UE may obtain the position of the PDSCH of the system information of the extension carrier CC3 in the CC3 according to the solved DCI.
Example 2
In this embodiment, a component carrier for sending system information is selected in a random selection manner, and a newly defined downlink control information format DCI format X is used for indication. Referring to fig. 1, it is assumed that there are three carriers CC1, CC2, CC 3. CC3 is an extension carrier, and PDCCH CC set (component carrier set) of UE has 2 component carriers, denoted as CC1 and CC 2.
The UE needs to acquire system information of CC1, CC2, and CC 3. The UE blindly detects the system information of CC1 on component carrier CC1, the system information of CC2 on component carrier CC2, and the system information of extension carrier CC3 on the carriers of the component carrier set, e.g., on CC1 and CC 2.
The base station configures the UE with a CRC of DCI in which system information of the extension carrier CC3 is scrambled with X-RNTI FFF4(16 th order) using higher layer signaling.
When the UE blindly detects the DCI of the system information of the extended carrier CC3 on the carriers CC1 and CC2 of the component carrier set, the CRC is descrambled by using X-RNTI FFF4(16 system), then the DCI information is checked, and the corresponding information is decoded according to the information content of the DCI format X.
And obtaining the component carrier corresponding to the system information SI according to the carrier indication CI information in the DCI format X, wherein the component carrier is CC 3. Then, the system information of the CC3 is decoded in the PDSCH of the CC3 according to the resource allocation information in the DCI format X.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (13)
1. A method for transmitting system information in a carrier aggregation scene is characterized by comprising the following steps:
selecting a component carrier for system information to be sent, and sending the system information to be sent to User Equipment (UE) on the selected component carrier by a base station;
and indicating the component carrier corresponding to the system information to be sent on the selected component carrier by using a wireless network temporary mark with carrier indication characteristics or a downlink control information format carrying carrier indication information.
2. The transmission method according to claim 1, further comprising:
and the User Equipment (UE) receives the system information on the selected component carrier, and distinguishes the component carrier corresponding to the system information by utilizing the wireless network temporary mark with carrier indication characteristics or the carrier indication information in the downlink control information format.
3. The transmission method according to claim 1, wherein the step of selecting component carriers for system information to be transmitted is implemented in one or a combination of the following manners:
the high layer signaling indicates the selected component carrier; automatically defaulting a unique carrier or a unique associated carrier; randomly selecting component carriers from a Physical Downlink Control Channel (PDCCH) component carrier set; the anchor carrier is employed as the selected component carrier.
4. Transmission method according to claim 1 or 3,
the step of indicating the component carrier corresponding to the system information to be sent on the selected component carrier by using the radio network temporary mark with the carrier indication characteristic or the downlink control information format carrying the carrier indication information is realized by defining a carrier indication radio network temporary identifier (CI-RNTI) or defining a downlink control information format (DCI format X).
5. The transmission method according to claim 4,
the carrier indication radio network temporary identifier value CI-RNTI is configured for each component carrier scheduled by the cross-carrier by a base station through high-level signaling, and the CI-RNTI values allocated to different component carriers are different;
and scrambling the Cyclic Redundancy Check (CRC) of the downlink control information format DCI format 1A/1C which is sent on the selected component carrier and carries the corresponding system information by using the CI-RNTI of the selected component carrier.
6. The transmission method according to claim 4,
the downlink control information format DCI format X at least comprises Carrier Indication (CI) information; adopting a centralized virtual resource block or a distributed virtual resource block resource allocation mode to indicate bits; resource block allocation bits, modulation coding mode indication bits and redundancy version indication bits.
7. The transmission method according to claim 4,
and scrambling downlink control information format DCI format X carrying the system information to be sent by adopting X-RNTI.
8. The transmission method according to claim 4,
the DCI format X carrying the other carriers SI may be defined to be located in a common search space or a UE-specific search space, or may be defined to be located only in a common search space.
9. The transmission method according to claim 4,
the DCI format X is a downlink control information format combined in the DCI format 1A, and when CRC of DCI of high-level signaling configuration system information is scrambled by X-RNTI, downlink control information solved by User Equipment (UE) corresponds to information carried by the DCI format X.
10. The transmission method according to claim 4,
the DCI format X is an independent downlink control information format, and at this time, the DCI format X also carries bit information distinguished from the DCI format 0/1a format.
11. A transmission system of system information in a carrier aggregation scenario, the transmission system comprising: base station and user equipment UE, wherein:
the base station is used for selecting a component carrier for the system information to be sent and sending the system information to be sent to User Equipment (UE) on the selected carrier, wherein the component carrier corresponding to the system information to be sent is determined on the selected component carrier by utilizing a wireless network temporary mark with carrier indication characteristics or a downlink control information format carrying the carrier indication information;
and the user equipment UE is used for receiving the system information sent from the base station on the selected component carrier, and distinguishing the component carrier corresponding to the system information by utilizing the wireless network temporary mark with the carrier indication characteristic or the carrier indication information in the downlink control information format.
12. Transmission system according to claim 11,
the base station selects component carriers for system information to be sent through one or the combination of the following modes:
the high layer signaling indicates the selected component carrier; automatically defaulting a unique carrier or a unique associated carrier; randomly selecting a component carrier from the PDCCH component carrier set, and employing the camping carrier as the selected component carrier.
13. Transmission system according to claim 11 or 12,
when the base station determines the component carrier corresponding to the system information to be sent on the selected component carrier by using the radio network temporary mark with the carrier indication characteristic or the downlink control information format carrying the carrier indication information, the base station is realized by defining a carrier indication radio network temporary identifier (CI-RNTI) or defining a new downlink control information format (DCI format X).
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| CN201010002226ACN101772179A (en) | 2010-01-08 | 2010-01-08 | Method and system for transmitting system information in carrier aggregation scene |
| PCT/CN2010/074724WO2011082572A1 (en) | 2010-01-08 | 2010-06-29 | Method, system and base station for transmitting system information under carrier aggregation circumstances |
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| CN201010002226ACN101772179A (en) | 2010-01-08 | 2010-01-08 | Method and system for transmitting system information in carrier aggregation scene |
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